1 /**
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package org.apache.hadoop.hbase;
19
20 import java.io.IOException;
21
22 import org.apache.hadoop.hbase.classification.InterfaceAudience;
23
24 /**
25 * The listener interface for receiving region state events.
26 */
27 @InterfaceAudience.Private
28 public interface RegionStateListener {
29
30 /**
31 * Process region split event.
32 *
33 * @param hri An instance of HRegionInfo
34 * @throws IOException
35 */
36 void onRegionSplit(HRegionInfo hri) throws IOException;
37
38 /**
39 * Process region split reverted event.
40 *
41 * @param hri An instance of HRegionInfo
42 * @throws IOException Signals that an I/O exception has occurred.
43 */
44 void onRegionSplitReverted(HRegionInfo hri) throws IOException;
45
46 /**
47 * Process region merge event.
48 *
49 * @param hri An instance of HRegionInfo
50 * @throws IOException
51 */
52 void onRegionMerged(HRegionInfo hri) throws IOException;
53 }